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Check the listing for details. DC 5-30V 5A DC Motor Controller PWM Adjustable Speed Digital display encoder. Condition: New. Listed at 5.98 USD. 3.2 operation of digital encoder knob. 2.2 rated current: 5A maximum current 15A. 2.2 working frequency: 1KHz~99KHz adjustable, 1KHz step, default frequency of 20KHz, accuracy of about 1%. frequency.The display form of duty cycle lower limit is "L" + two digits, the display form of duty cycle upper limit is "H" + two digits or "100", and the display form of working frequency is "F" + two digits.